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MIC5245-2.6YM5-TR

P1-P3P4-P6P7-P9P10-P12
MIC5245 Micrel
August 2002 1 MIC5245
General Description
The MIC5245 is an efficient, precise CMOS voltage regulator
optimized for ultra-low-noise applications. The MIC5245 of-
fers better than 1% initial accuracy, extremely low dropout
voltage (typically 150mV at 150mA) and constant ground
current over load (typically 100µA). The MIC5245 provides a
very low noise output, ideal for RF applications where quiet
voltage sources are required. A noise bypass pin is also
available for further reduction of output noise.
Designed specifically for hand-held and battery-powered
devices, the MIC5245 provides a TTL logic compatible en-
able pin. When disabled, power consumption drops nearly to
zero.
The MIC5245 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in hand-held wireless devices.
Key features include current limit, thermal shutdown, a push-
pull output for faster transient response, and an active clamp
to speed up device turnoff. Available in the IttyBitty™ SOT-23-5
and power MSO-8 packages, the MIC5245 also offers a
range of fixed output voltages.
Not recommended for new designs, see MIC5255.
Typical Application
15
2
3
4
C
OUT
C
BYP
Enable
Shutdown
EN
V
OUT
(optional)
MIC5245-x.xBM5
E
N (pin 3) may be
c
onnected directly
o
IN (pin 1).
V
IN
MIC5245
150mA µCap CMOS LDO Regulator
Final Information
Features
• Ultralow dropout—100mV @ 100mA
• Ultralow noise—30µV(rms)
• Stability with tantalum or ceramic capacitors
• Load independent, ultralow ground current
• 150mA output current
• Current limiting
• Thermal Shutdown
• Tight load and line regulation
•“Zero” off-mode current
• Fast transient response
• TTL-Logic-controlled enable input
Applications
• Cellular phones and pagers
• Cellular accessories
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• PCMCIA V
CC
and V
PP
regulation/switching
• Consumer/personal electronics
• SMPS post-regulator/dc-to-dc modules
• High-efficiency linear power supplies
Ordering Information
Part Number Marking Voltage Junction Temp. Range Package
MIC5245-2.5BM5 LS25 2.5V –40°C to +125°C SOT-23-5
MIC5245-2.7BM5 LS27 2.7V –40°C to +125°C SOT-23-5
MIC5245-2.8BM5 LS28 2.8V –40°C to +125°C SOT-23-5
MIC5245-2.85BM5 LS2J 2.85V –40°C to +125°C SOT-23-5
MIC5245-3.0BM5 LS30 3.0V –40°C to +125°C SOT-23-5
MIC5245-3.1BM5 LS31 3.1V –40°C to +125°C SOT-23-5
MIC5245-3.2BM5 LS32 3.2V –40°C to +125°C SOT-23-5
MIC5245-3.3BM5 LS33 3.3V –40°C to +125°C SOT-23-5
MIC5245-3.3BMM — 3.3V –40°C to +125°C MSOP-8
Other voltages available. Contact Micrel for details.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
1
2
3
4
8
7
6
5
MIC5245-3.3MM
ENABLE
SHUTDOWN
C
BYP
(OPTIONAL)
V
IN
V
OUT
C
OUT
Ultra-Low-Noise Regulator Application
MIC5245 Micrel
MIC5245 2 August 2002
Pin Configuration
IN
OUTBYP
EN
LSxx
13
45
2
GND
MIC5245-x.xBM5
Absolute Maximum Ratings (Note 1)
Supply Input Voltage (V
IN
) .................................. 0V to +7V
Enable Input Voltage (V
EN
) ................................. 0V to +7V
Junction Temperature (T
J
) ...................................... +150°C
Storage Temperature ............................... –65°C to +150°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
ESD, Note 3
Operating Ratings (Note 2)
Input Voltage (V
IN
) ......................................... +2.7V to +6V
Enable Input Voltage (V
EN
) .................................. 0V to V
IN
Junction Temperature (T
J
) .......................–40°C to +125°C
Thermal Resistance
SOT-23 (θ
JA
) .....................................................235°C/W
MSOP-8 (θ
JA
) ......................................................80°C/W
Pin Description
Pin Number Pin Number Pin Name Pin Function
Power MOS-8 SOT-23
2 1 IN Supply Input
5–8 2 GND Ground
1 3 EN Enable/Shutdown (Input): CMOS compatible input. Logic high = enable;
logic low = shutdown. Do not leave open.
4 4 BYP Reference Bypass: Connect external 0.01µF capacitor to GND to reduce
output noise. May be left open.
3 5 OUT Regulator Output
1
IN
OUT
BYP
8 GND
GND
GND
GND
7
6
5
2
3
4
EN
8-Pin MSOP (BMM)
MIC5245 Micrel
August 2002 3 MIC5245
Electrical Characteristics
(Note 7)
V
IN
= V
OUT
+ 1V, V
EN
= V
IN;
I
OUT
= 100µA; T
J
= 25°C, bold values indicate –40°C ≤ T
J
≤ +125°C; unless noted.
Symbol Parameter Conditions Min Typical Max Units
V
O
Output Voltage Accuracy I
OUT
= 0mA –11%
–22%
∆V
LNR
Line Regulation V
IN
= V
OUT
+ 0.1V to 6V –0.3 0 0.3 %/V
∆V
LDR
Load Regulation I
OUT
= 0.1mA to 150mA, Note 4 2.0 3.0 %
V
IN
– V
OUT
Dropout Voltage, Note 5 I
OUT
= 100µA 1.5 5 mV
I
OUT
= 50mA 50 85 mV
I
OUT
= 100mA 100 150 mV
I
OUT
= 150mA 150 200 mV
250 mV
I
Q
Quiescent Current V
EN
≤ 0.4V (shutdown) 0.2 1 µA
I
GND
Ground Pin Current, Note 6 I
OUT
= 0mA 100 150 µA
I
OUT
= 150mA 100 µA
PSRR Power Supply Rejection f = 120Hz, C
OUT
= 10µF, C
BYP
= 0.01µF50dB
I
LIM
Current Limit V
OUT
= 0V 160 300 mA
e
n
Output Voltage Noise C
OUT
= 10µF, C
BYP
= 0.01µF, 30
µV(rms)
f = 10Hz to 100kHz
Enable Input
V
IL
Enable Input Logic-Low Voltage V
IN
= 2.7V to 5.5V, regulator shutdown 0.8 0.4 V
V
IH
Enable Input Logic-High Voltage V
IN
= 2.7V to 5.5V, regulator enabled 2.0 1V
I
EN
Enable Input Current V
IL
≤ 0.4V 0.17 µA
V
IH
≥ 2.0V 1.5 µA
Shutdown Resistance Discharge 500 Ω
Thermal Protection
Thermal Shutdown Temperature 150 °C
Thermal Shutdown Hysteresis 10 °C
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended.
Note 4. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load
range from 0.1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Note 5. Dropout Voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V
differential. For outputs below 2.7V, dropout voltage is the input-to-output voltage differential with the minimum input voltage 2.7V. Minimum
input operating voltage is 2.7V.
Note 6. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground
pin current.
Note 7. Specification for packaged product only.
P1-P3P4-P6P7-P9P10-P12

MIC5245-2.6YM5-TR

Mfr. #:
Buy MIC5245-2.6YM5-TR
Manufacturer:
Microchip Technology / Micrel
Description:
LDO Voltage Regulators Low Noise, IttyBitty, CMOS LDO
Lifecycle:
New from this manufacturer.
Delivery:
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